BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Acorn Woodpecker In Great Basin

All regionsGreat BasinForest birds

Acorn Woodpecker in Great Basin has surged: up 564% on the route-weighted index since 1972.

+564%Since 1972TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
6Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
39YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Acorn Woodpecker in Great Basin. See the full index history below.

Acorn Woodpecker In Great Basin Population Forecast

If the recent trend holds, Acorn Woodpecker in Great Basin is projected to rise about 19% by 2024 — from 0.28 in 2019 to a central estimate of 0.34 (95% range 0.16–0.52). A 5-year backtest shows a typical error of ±24.4%, with 100% of held-out values landing inside the 95% band.

+19%Change by 2024TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.34Projected 2024 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.16–0.5295% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±24.4%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Acorn Woodpecker in Great Basin is projected to rise about 19% by 2024 — from 0.28 in 2019 to a central estimate of 0.34 (95% range 0.16–0.52). A 5-year backtest shows a typical error of ±24.4%, with 100% of held-out values landing inside the 95% band.19702024
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20200.320.140.49
20210.320.140.50
20220.330.150.51
20230.330.150.51
20240.340.160.52

Routes In Great Basin

Routes recording Acorn Woodpecker in Great Basin.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Iron GateCALIFORNIA412019
NubieberCALIFORNIA42018
Fall River MillsCALIFORNIA32011
MacdoelCALIFORNIA22010
LikelyCALIFORNIA12015
BartleCALIFORNIA12009

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.